What's the keyboard shortcut that I use when cutting and pasting into Google Doc if I want to have it go to the formatting of Google Doc?

Clear as a solid text box? In other words, how does she paste this bold size-14 text, written in Happy Monkey font

into another document (size 12 Didact Gothic) without having to reformat the text to make it match what she's already written once it's in there?

Short answer: ​Control/Command + Shift + V

If you know even the most basic keyboard shortcuts, then you know Ctrl + V for paste, right? If you're working in Google Docs, then you want to know what happens when you throw a Shift in there, too. Let's watch what happens when you just paste the regular way:

​In order to change the new text to match the old text, now she would have to select all of it, go up to the font menu, find and select the font, align all of the text to the left margin, be sure it's still selected, then repeat all of those steps with the size. Who wants to do all of that extra clicking when a simple keystroke would do the trick?! Now watch what happens when I simply hold down the Shift key while I paste: